Key switch and socket

Abstract

The invention discloses a key switch and a socket, and relates to the technical field of electric appliances. The key switch comprises a shell, an overload protection piece, a movable contact piece, a first terminal and a pressing assembly, the shell is provided with an installation cavity, and the overload protection piece with the static contact and the movable contact piece with the movable contact are located in the installation cavity; the first terminal comprises an input terminal and an output terminal which are mutually independent, and the input terminal and the output terminal are respectively connected with the overload protection piece and the movable contact piece; the pressing assembly is installed on the shell and located on the side, away from the overload protection piece, of the movable contact piece, and the pressing assembly can be pressed to enable the movable contact to move in the direction close to the static contact. When the movable contact is in contact with the static contact, the input terminal and the output terminal are electrically conducted; and the overload protection piece is configured to drive the static contact to be separated from the movable contact when the current flowing through the overload protection piece exceeds a set threshold value. Therefore, the key switch and the socket disclosed by the invention are simple in structure and small in occupied space.

Description

Technical Field

[0001] The present application relates to the field of electrical appliance technology, and in particular to a key switch and a socket. Background Art

[0002] By integrating a switch module on the socket, the on and off state of the electrical appliance on the socket can be conveniently controlled, thus avoiding damage caused by frequent plugging and unplugging of the electrical appliance.

[0003] Sockets generally use push-type switch modules, most of which are key switches. However, existing key switches do not have an overload protection function. When used in sockets and other electrical products, an independent overload protector or fuse needs to be configured, which increases the number of parts, complicates the structure, and increases the space occupied. Summary of the invention

[0004] In view of this, the present application provides a push button switch and a socket with a simple structure and a small space occupation volume.

[0005] This application specifically adopts the following technical solutions:

[0006] On the one hand, an embodiment of the present application provides a key switch, including a housing, an overload protection member, a moving contact piece, a first terminal and a pressing assembly;

[0007] The housing has an installation cavity, the overload protection member and the moving contact piece are both located in the installation cavity, wherein the overload protection member has a static contact point, and the moving contact piece has a moving contact point;

[0008] The first terminal includes an input terminal and an output terminal which are independent of each other, and the input terminal and the output terminal are connected to the overload protection member and the moving contact piece respectively;

[0009] The pressing assembly is mounted on the housing and is located on a side of the moving contact piece away from the overload protection member, and the pressing assembly can be pressed to cause the moving contact to move toward the static contact;

[0010] Among them, when the moving contact is in contact with the static contact, the input terminal and the output terminal are electrically connected; the overload protection component is configured to: when the current flowing through the overload protection component exceeds a set threshold, drive the static contact to break contact with the moving contact.

[0011] Optionally, the overload protection element is a bimetallic strip, the bimetallic strip has a first end and a second end opposite to each other, the first end is fixed to the housing and connected to the input terminal, and the second end is suspended and has the static contact;

[0012] Wherein, the bimetallic strip can be deformed to move the second end away from the moving contact.

[0013] Optionally, the key switch further comprises an elastic member, and two ends of the elastic member are elastically matched with the housing and the second end of the bimetallic strip respectively;

[0014] The elastic member can apply elastic force to the bimetallic strip so that the second end of the bimetallic strip is maintained in a first position or a second position, wherein when the second end of the bimetallic strip is located at the first position, the static contact can contact and cooperate with the moving contact; when the second end of the bimetallic strip is located at the second position, there is a gap between the static contact and the moving contact.

[0015] Optionally, a clamping portion is provided on the inner wall of the shell, and one end of the elastic member is clamped and matched with the clamping portion;

[0016] and / or,

[0017] The second end of the bimetallic strip is provided with an inserting portion, and the other end of the elastic member is plug-fitted with the inserting portion.

[0018] Optionally, the elastic member comprises a U-shaped elastic piece and a connecting piece, the U-shaped elastic piece has a first free end and a second free end, and the connecting piece is bent and connected to an outer side wall of the first free end;

[0019] The engaging portion is a slot, the connecting piece is located in the slot and elastically abuts against the slot wall of the slot;

[0020] The plug-in portion is a slot or a socket, and the second free end of the U-shaped spring sheet is provided with a notch in the width direction to form a plug-in piece, and the plug-in piece extends into the slot or the socket and elastically abuts against the inner wall of the slot or the socket.

[0021] Optionally, the key switch further comprises a reset rocker and a reset rod;

[0022] The reset rocker is located at a side of the overload protection member away from the moving contact piece, wherein when the second end of the bimetallic strip is located at the second position, the plate surface of the reset rocker contacts the second end of the bimetallic strip, and the third end of the reset rocker droops, and the fourth end of the reset rocker rises; wherein the third end and the fourth end of the reset rocker are opposite and respectively located on both sides of the fulcrum of the reset rocker, and the third end and the static contact are located on the same side of the fulcrum;

[0023] The reset rod is mounted on the housing and contacts the fourth end of the reset rocker. The reset rod can be pressed by the pressing assembly to push the raised fourth end of the reset rocker to descend.

[0024] Optionally, a weight reduction structure is provided at the third end of the reset rocker.

[0025] Optionally, a first protrusion is formed on the housing in the installation cavity, the first protrusion is located on a side of the reset rocker away from the overload protection member, and a fulcrum of the reset rocker is placed on the first protrusion.

[0026] Optionally, the housing forms a second protrusion in the mounting cavity, the second protrusion is located on a side of the reset rocker away from the first protrusion and contacts the fulcrum of the reset rocker to limit the reset rocker between the first protrusion and the second protrusion.

[0027] Optionally, the housing forms a third protrusion in the installation cavity, the third protrusion is located beside the reset rocker, the reset rocker is provided with a limiting notch at the fulcrum, and the third protrusion is located in the limiting notch.

[0028] Optionally, in the installation cavity, the reset rod is located on a side of the reset rocker plate close to the moving contact piece;

[0029] One end of the reset rod passes through a through opening provided on the housing and extends toward the pressing assembly;

[0030] The other end of the reset rod is provided with an escape opening, and the movable contact piece and the overload protection member both pass through the escape opening.

[0031] Optionally, the pressing assembly includes a switch cap, a bracket, a first elastic pressing piece, a second elastic pressing piece and a push rod assembly;

[0032] The switch cap is fixed on the bracket to receive pressing force;

[0033] The bracket is movably connected to the housing and elastically connected to the first elastic pressing member, and the first elastic pressing member is used to provide the bracket with a restoring force in the opposite direction to the pressing force;

[0034] The push rod assembly is mounted on the housing, and the second elastic pressing member is elastically mounted between the push rod assembly and the moving contact piece, wherein the push rod assembly can be actuated by the bracket to push the second elastic pressing member to press the moving contact piece.

[0035] Another aspect of the embodiment of the present application provides a socket, which includes the above-mentioned push button switch.

[0036] The key switch provided in the embodiment of the present application splits the first terminal into an input terminal and an output terminal, and connects them to the moving contact piece and the overload protection piece respectively; a moving contact is provided on the moving contact piece, and a static contact is provided on the overload protection piece. When the key switch does not need to be powered on, the moving contact and the static contact are separated, the input terminal and the output terminal are independent of each other, and the first terminal is not powered; when the key switch needs to be powered on, force can be applied to the pressing component to actuate the moving contact piece to drive the moving contact to move until the moving contact contacts the static contact, so that the input terminal and the output terminal are electrically connected, and the first terminal is powered; when the key switch is powered on, when the current flowing through the overload protection piece is overloaded, that is, exceeds the current threshold, the overload protection piece will drive the static contact away from the moving contact, thereby disconnecting the electrical conduction between the input terminal and the output terminal, and then powering off the key switch. Therefore, the key switch provided in the embodiment of the present application combines the traditional key switch with the overload protection piece, realizes the switch on-off function and the overload protection function through a simple structure, occupies a small space, and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 is a first isometric diagram of a key switch provided in an embodiment of the present application;

[0039] Figure 2 is a second isometric diagram of a key switch provided in an embodiment of the present application;

[0040] Figure 3 is an exploded view of a key switch provided in an embodiment of the present application;

[0041] Figure 4 It is a schematic diagram of the internal structure of a key switch provided in an embodiment of the present application;

[0042] Figure 5 It is a structural schematic diagram of a key switch provided by an embodiment of the present application, in which the second end of the bimetallic strip is located at a first position and the moving and static contacts are in contact with each other;

[0043] Figure 6 It is a structural schematic diagram of a push button switch provided in an embodiment of the present application, in which the second end of the bimetallic strip is located at a second position and the moving and static contacts are separated;

[0044] Figure 7 This is a schematic diagram of the assembly of an elastic member in a key switch provided in an embodiment of the present application;

[0045] Figure 8 This is a schematic diagram of the connection structure between an input terminal and an overload protection component in a key switch provided in an embodiment of the present application;

[0046] Fig. 9 It is a schematic diagram of the cooperation relationship between the second end of the bimetallic strip and the reset rocker and the reset rod when the second end of the bimetallic strip is located at the second position in a key switch provided by an embodiment of the present application;

[0047] Fig.10 It is a schematic diagram of assembling a reset rocker and a reset rod in a key switch provided in an embodiment of the present application;

[0048] Fig.11 is a structural schematic diagram of a key switch provided in an embodiment of the present application when it is in an off state;

[0049] Fig.12 is a structural schematic diagram of a key switch provided in an embodiment of the present application when it is in an on state;

[0050] Fig.13 It is a structural schematic diagram of a key switch provided in an embodiment of the present application when it is in an overload protection state.

[0051] Reference numerals:

[0052] 1. housing; 11. mounting cavity; 12. base; 13. shell; 14. engaging portion; 141. slot; 15. first protrusion; 16. second protrusion; 17. third protrusion; 18. through opening;

[0053] 2. Overload protection member; 21. Static contact; 22. First end; 23. Second end; 24. Plug-in portion; 241. Slot;

[0054] 3. Moving contact; 31. Moving contact;

[0055] 4. first terminal; 41. input terminal; 42. output terminal;

[0056] 5. Pressing assembly; 51. Switch cap; 52. Bracket; 53. First elastic pressing member; 54. Second elastic pressing member; 55. Push rod assembly; 551. First push rod; 552. Second push rod;

[0057] 6. elastic member; 61. U-shaped spring piece; 611. first free end; 612. second free end; 613. outer side wall; 614. notch; 615. plug-in piece; 62. connecting piece;

[0058] 7. reset rocker; 71. third end; 72. fourth end; 73. fulcrum; 74. weight-reducing structure; 75. limit notch;

[0059] 8. Reset lever; 81. Avoid opening;

[0060] 9. indicator light assembly; 91. light emitting element; 92. resistor;

[0061] 10. Second terminal.

[0062] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0065] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0066] An embodiment of the present application provides a key switch, which may also be called a push switch, a button switch, etc. in the art.

[0067] Figure 1 and Figure 2 The structure of one side and the structure of the other side of the key switch provided in the embodiment of the present application are respectively shown. Figure 3 This is an exploded view of the key switch. Figure 4 It is a cross-sectional view of the internal structure of the push button switch.

[0068] like Figures 1 to 4As shown, the key switch provided by the embodiment of the present application includes a housing 1, an overload protection member 2, a movable contact piece 3, a first terminal 4 and a pressing assembly 5. The housing 1 has an installation cavity 11, and the overload protection member 2 and the movable contact piece 3 are both located in the installation cavity 11. The overload protection member 2 has a static contact 21, and the movable contact piece 3 has a movable contact 31; the first terminal 4 includes an input terminal 41 and an output terminal 42 that are independent of each other, and the input terminal 41 and the output terminal 42 are connected to the overload protection member 2 and the movable contact piece 3 respectively; the pressing assembly 5 is installed on the housing 1 and is located on the side of the movable contact piece 3 away from the overload protection member 2, and the pressing assembly 5 can be pressed so that the movable contact 31 moves in a direction close to the static contact 21. Among them, when the movable contact 31 contacts the static contact 21, the input terminal 41 and the output terminal 42 are electrically conductive; the overload protection member 2 is configured to: when the current flowing through the overload protection member 2 exceeds a set threshold, drive the static contact 21 to break contact with the movable contact 31.

[0069] The key switch provided in the embodiment of the present application splits the first terminal 4 into an input terminal 41 and an output terminal 42 which are independent of each other, and adds a moving contact piece 3 and an overload protection piece 2 in the key switch, wherein the moving contact piece 3 and the overload protection piece 2 are respectively connected to the input terminal 41 and the output terminal 42; a moving contact point 31 is provided on the moving contact piece 3, and a static contact point 21 is provided on the overload protection piece 2. When the key switch does not need to be powered, the moving contact 31 and the static contact 21 are separated from each other, the input terminal 41 and the output terminal 42 are spaced apart from each other, and the first terminal 4 is not energized; when the key switch needs to be powered, force can be applied to the pressing component 5 to actuate the moving contact piece 3 to drive the moving contact 31 to move until the moving contact 31 contacts the static contact 21, so that the input terminal 41 and the output terminal 42 are electrically connected, and the first terminal 4 is energized; when the key switch is powered, when the current flowing through the overload protection member 2 is overloaded, that is, exceeds the current threshold, the overload protection member 2 will drive the static contact 21 away from the moving contact 31, thereby disconnecting the electrical connection between the input terminal 41 and the output terminal 42, and then the key switch is powered off to achieve a protective effect. Therefore, the key switch provided in the embodiment of the present application combines the traditional key switch with the overload protection member 2, realizes the switch on-off function and the overload protection function through a simple structure, occupies a small space, and has good safety.

[0070] In order to make the technical solution and advantages of this application clearer, Figure 1-13 , the key switch provided in the embodiment of the present application is further introduced and illustrated.

[0071] like Figure 1 and Figure 2 As shown, a key switch provided in an embodiment of the present application has a first terminal 4 and a second terminal 10. The key switch can be powered by connecting the first terminal 4 and the second terminal 10 to the live wire and the neutral wire in the power supply circuit respectively.

[0072] The first terminal 4 includes an input terminal 41 and an output terminal 42 which are independent of each other. The input terminal 41, the output terminal 42 and the second terminal 10 are all mounted on the housing 1 and exposed from the outside of the housing 1. Figure 1 and Figure 2 , the output terminal 42 and the second terminal 10 are located on the same side of the housing 1 , and the input terminal 41 and the output terminal 42 are located on opposite sides of the housing 1 .

[0073] In one example, the first terminal 4 is an L-pole terminal, whose input terminal 41 is connected to the live wire in the power supply circuit, and whose output terminal 42 is connected to the L-pole terminal in the electrical product (for example, the L-pole socket in the socket); the second terminal 10 is an N-pole terminal, which is connected to the neutral wire in the power supply circuit and the N-pole terminal in the electrical product (for example, the N-pole socket in the socket).

[0074] Of course, in other examples, the first terminal 4 can also be an N-pole terminal, whose input terminal 41 is connected to the neutral line in the power supply circuit, and whose output terminal 42 is connected to the N-pole terminal in the electrical product (for example, the N-pole socket in the socket); the second terminal 10 can also be an L-pole terminal, which is connected to the neutral line in the power supply circuit and the L-pole terminal in the electrical product (for example, the L-pole socket in the socket).

[0075] In this case, an electrical indicator device may be provided for the key switch to indicate the on / off state of the key switch. The electrical indicator device may be, for example, an indicator light assembly 9, a buzzer assembly, etc., and the specific arrangement of the indicator light assembly 9 will be specifically described below with reference to the example of the indicator light assembly 9.

[0076] In addition, if there is no need to arrange an electrical indication device, in some other embodiments of the present application, the push switch may also have only a first terminal 4. In this case, the first terminal 4 is usually an L terminal, and its wiring method is the same as the wiring method of the above-mentioned L terminal, which will not be repeated here.

[0077] In the embodiment of the present application, the input terminal 41 and the output terminal 42 in the first terminal 4 are connected to the overload protection member 2 and the moving contact piece 3 respectively. Figure 4 As shown, the input terminal 41 may be connected to the overload protection element 2 , and the output terminal 42 may be connected to the movable contact piece 3 ; or, the input terminal 41 may be connected to the movable contact piece 3 , and the output terminal 42 may be connected to the overload protection element 2 .

[0078] Alternatively, if Figure 8 As shown, the input terminal 41 and the overload protection member 2 are connected by riveting; and / or, the output terminal 42 and the moving contact piece 3 are an integrally formed structure.

[0079] The first terminal 4, the overload protection member 2 and the movable contact piece 3 are all installed and fixed by the housing 1. In some embodiments of the present application, for example Figure 3 and Figure 4 As shown, the housing 1 of the key switch may include a base 12 and a shell 13, both of which are made of insulating materials. The two are detachably connected and surround a mounting cavity 11. Exemplarily, the base 12 and the shell 13 may be connected by snap-fit. The overload protection member 2, the moving contact piece 3, and a portion of the first terminal 4 are accommodated and fixed in the mounting cavity 11, wherein, as shown in FIG. Figure 1 and Figure 2 As shown, a through opening 18 is provided on the base 12 or the shell 13, or a through gap is formed at the matching position of the base 12 and the shell 13, so that the input terminal 41 or the output terminal 42 can pass therethrough.

[0080] like Figure 5 and Figure 6 As shown, the base 12 is formed with a first slot 241 and a second slot 241 at intervals, and the first slot 241 and the second slot 241 are filled with an insulating medium, for example, an insulating partition is formed on the base 12, and the opposite side surfaces of the insulating partition respectively form adjacent slot walls of the first slot 241 and the second slot 241. The moving contact piece 3 is inserted into the first slot 241 for fixing, and the overload protection member 2 is inserted into the second slot 241 for fixing, and the moving contact piece 3 and the overload protection member 2 are separated by the insulating partition.

[0081] A moving contact 31 is provided on the side of the moving contact piece 3 facing the overload protection piece 2. For example, the moving contact 31 is welded to the moving contact piece 3. A stationary contact 21 is provided on the side of the overload protection piece 2 facing the moving contact piece 3. For example, the stationary contact 21 is welded to the overload protection piece 2. The moving contact 31 can be in contact with the stationary contact 21, thereby electrically conducting the moving contact piece 3 and the overload protection piece 2, and then electrically conducting the input terminal 41 and the output terminal 42. It should be understood that the overload protection piece 2 provided in the embodiment of the present application is conductive.

[0082] The pressing assembly 5 is mounted on the housing 1, for example, see Figure 1 and Figure 4 The pressing assembly 5 is mounted on the shell 13 and is located on the side of the movable contact piece 3 away from the overload protection member 2. The user can apply a pressing force to the pressing assembly 5 to actuate the movable contact 31 to move closer to the static contact 21 until it contacts the static contact 21, thereby electrically conducting the first terminal 4.

[0083] The overload protection element 2 is used to prevent the circuit where the key switch is located from being overloaded and causing deformation or even burning of the material. When the current flowing through the overload protection element 2 exceeds a set threshold (i.e., overload), the static contact 21 can be driven to move, thereby causing it to break contact with the moving contact 31, thereby achieving the effect of disconnecting the circuit.

[0084] The threshold value may be set by a person skilled in the art according to the safety electricity use requirement or actual demand.

[0085] In some embodiments of the present application, the overload protection member 2 may be a bimetallic strip, such as Figure 5 As shown, the bimetal strip has a first end 22 and a second end 23 opposite to each other. The first end 22 is fixed to the housing 1 and connected to the input terminal 41 . The second end 23 is suspended and has a static contact 21 .

[0086] Exemplarily, the first end 22 of the bimetallic strip is fixed in the second slot 241 of the base 12 .

[0087] Alternatively, if Fig.11 As shown, the housing 1 has a limiting rib, which can abut against the second end 23 of the bimetallic strip at a side of the bimetallic strip close to the pressing assembly 5 to limit the suspended height of the second end 23 of the bimetallic strip.

[0088] The bimetallic strip is composed of two metals with different thermal expansion coefficients. When current passes through, the bimetallic strip will bend and deform due to the heat generated by the current. In the embodiment of the present application, when the bimetallic strip is deformed, its second end 23 bends in a direction away from the moving contact 31. In this way, when the circuit is overloaded, the static contact 21 will be away from the moving contact 31 due to the bending deformation of the second end 23 of the bimetallic strip, thereby disconnecting the circuit and cutting off the power to the key switch.

[0089] In some embodiments of the present application, Figure 5 and Figure 6 As shown, the key switch further comprises an elastic member 6, two ends of which are elastically matched with the housing 1 and the second end 23 of the bimetallic strip respectively, that is, the elastic member 6 is always in an elastically deformed state.

[0090] Under the elastic force applied by the elastic member 6, the second end 23 of the bimetallic strip can be maintained at the first position and the second position. The first position is the position of the second end 23 of the bimetallic strip when it is not bent or deformed due to high temperature. When the second end 23 of the bimetallic strip is at the first position, the static contact 21 can contact and cooperate with the moving contact 31. Fig.11 and Fig.12When the push switch is in the off state or the on state, the second end 23 of the bimetallic strip is located at the first position. The second position is the position where the second end 23 of the bimetallic strip is located after the bimetallic strip is bent and deformed due to high temperature. When the second end 23 of the bimetallic strip is located at the second position, there is a gap between the static contact 21 and the moving contact 31, and the moving contact 31 cannot contact the static contact 21. Fig.13 As shown, when the key switch is in the overload protection state, the second end 23 of the bimetallic strip is located at the second position.

[0091] By providing the elastic member 6, the unstable power connection phenomenon caused by the slight deformation of the bimetal strip can be suppressed, thereby improving the stability of the circuit. Specifically, when the circuit is just overloaded, the heat generated by the overload current will cause the bimetal strip to deform, thereby causing the moving contact to move away from the static contact and disconnect the circuit. However, after the circuit is disconnected, no current will flow through the bimetal strip, and the bimetal strip will cool down and gradually restore its deformation until it re-contacts the static contact. After contact, due to the circuit overload, the bimetal strip will deform again and disconnect the circuit, and this cycle will repeat, causing the circuit to be unstable. After the elastic member 6 is provided, it can apply an elastic force to the bimetal strip to keep the static contact 21 and the moving contact 31 in close contact. When the bimetal strip is slightly deformed due to the heat generated by the circuit overload, the deformation force is too small to overcome the elastic force, so the static contact 21 and the moving contact 31 remain in contact and the circuit is still turned on; when the overload current is large, the heat generated is also large, the deformation degree of the bimetal strip increases, and the deformation force overcomes the elastic force to separate the static contact 21 and the moving contact 31, thereby disconnecting the circuit.

[0092] The elastic member 6 is accommodated in the mounting cavity 11 of the housing 1, and the two ends of the elastic member 6 are elastically connected or abutted against the housing 1 and the second end 23 of the bimetallic strip, respectively. Figure 7 As shown, a snap-fit ​​portion 14 may be provided on the inner wall of the housing 1, and one end of the elastic member 6 may be snap-fitted with the snap-fit ​​portion 14; and / or, a plug-in portion 24 may be provided at the second end 23 of the bimetallic strip, and the other end of the elastic member 6 may be plug-fitted with the plug-in portion 24.

[0093] In one example, see Figure 7, the elastic member 6 may include a U-shaped spring piece 61 and a connecting piece 62, the U-shaped spring piece 61 having a first free end 611 and a second free end 612 at the opening, the connecting piece 62 being bent and connected to the outer wall 613 of the first free end 611. The engaging portion 14 on the inner wall of the housing 1 may be a card slot 141, the connecting piece 62 is located in the card slot 141, and elastically abuts against the slot wall of the card slot 141; and / or, the plug-in portion 24 of the second end 23 of the bimetallic strip may be a slot 241 or a socket (not shown in the figure), the second free end 612 of the U-shaped spring piece 61 is provided with a notch 614 in the width direction to form a plug-in piece 615, the plug-in piece 615 extends into the slot 241 or the socket of the second end 23 of the bimetallic strip, and elastically abuts against the inner wall of the slot 241 or the socket, and the notch 614 abuts against the side wall edge of the slot 241 or the socket.

[0094] In another example of the present application, the locking portion 14 on the inner wall of the shell 1 can also be a hook, and the connecting plate 62 can be provided with a locking hole for hooking with the hook; and / or, the plug-in portion 24 of the second end 23 of the bimetallic strip can be an insert, and the second free end 612 of the U-shaped spring piece 61 is provided with a socket in the width direction for plugging with the insert.

[0095] Optionally, the width of the connecting piece 62 is greater than the width of the U-shaped spring piece 61 , so that the connecting piece 62 and the card slot 141 on the housing 1 have a larger matching surface to ensure the reliability of the card connection.

[0096] Alternatively, if Figure 7 As shown, a groove can also be provided on the side of the connecting piece 62 away from the U-shaped spring piece 61, and the groove can be used to limit the connecting piece 62 and the slot 141 and the mating point to prevent the connecting piece 62 from shifting or detaching from the slot 141; or, the groove can also be used to reduce the difficulty of elastic deformation of the elastic member 6; or, the groove can also be used to reduce the dead weight of the elastic member 6.

[0097] Optionally, the elastic member 6 may be a metal spring sheet, and the U-shaped spring sheet 61 and the connecting sheet 62 are an integrally formed structure.

[0098] The bimetallic strip will bend and deform at high temperatures, and will return to its original shape after cooling. In the embodiment of the present application, when an overload phenomenon occurs and the temperature of the bimetallic strip rises, the second end 23 of the bimetallic strip will be in the second position based on its own bending deformation and the elastic force of the elastic member 6; and after the temperature of the bimetallic strip drops, its own restoring deformation force is not enough to overcome the elastic force of the elastic member 6, so the second end 23 of the bimetallic strip will still remain in the second position. That is to say, when the key switch is Fig.13 In the overload protection state shown, due to the elastic force of the elastic member 6, the second end 23 of the bimetallic strip cannot actively return to the first position.

[0099] In order to realize the continued use of the key switch after the overload disconnection, in some embodiments of the present application, such as Fig. 9 As shown, the key switch further comprises a reset rocker 7 and a reset rod 8. The reset rocker 7 and the reset rod 8 cooperate with each other so that the second end 23 of the bimetallic strip can passively return from the second position to the first position.

[0100] See also Fig. 9 The reset rocker 7 is located at a side of the overload protection member 2 away from the movable contact piece 3, wherein when the second end 23 of the bimetallic strip is located at the second position, the plate surface of the reset rocker 7 contacts the second end 23 of the bimetallic strip, and the third end 71 of the reset rocker 7 droops, and the fourth end 72 of the reset rocker 7 tilts. The third end 71 and the fourth end 72 of the reset rocker 7 are opposite and respectively located on both sides of the fulcrum 73 of the reset rocker 7, and the third end 71 and the static contact 21 are located on the same side of the fulcrum 73.

[0101] When the second end 23 of the bimetallic strip is at the first position, the plate surface of the reset rocker 7 may contact with the second end 23 of the bimetallic strip, or may not contact with the second end 23 of the bimetallic strip. Fig.11 When the second end 23 of the bimetallic strip is at the first position and the reset rocker 7 is not in contact with the bimetallic strip, the third end 71 of the reset rocker 7 may be tilted, drooped, or substantially flush with the fourth end 72 of the reset rocker 7.

[0102] It should be noted that the third end 71 of the reset rocker 7 droops and the fourth end 72 tilts, which means that the height of the third end 71 of the reset rocker 7 is lower than the height of the fourth end 72. The height direction is parallel to the pressing direction of the pressing component 5. For the third end 71 and the fourth end 72 of the reset rocker 7, the closer to the pressing component 5, the higher the height. Conversely, the third end 71 of the reset rocker 7 tilts and the fourth end 72 droops, which means that the height of the third end 71 of the reset rocker 7 is higher than the height of the fourth end 72.

[0103] In addition, in the embodiment of the present application, the “fulcrum 73 of the reset rocker 7 ” refers to the physical part of the reset rocker 7 that serves as the rocker fulcrum.

[0104] Continue to see Fig. 9 The reset rod 8 is installed on the housing 1 and contacts the fourth end 72 of the reset rocker 7. The reset rod 8 can be pressed by the pressing assembly 5 to push the raised fourth end 72 of the reset rocker 7 down.

[0105] The reset rod 8 is located between the pressing assembly 5 and the fourth end 72 of the reset rocker 7, and can move toward the reset rocker 7 under the actuation of the pressing assembly 5. Therefore, when the second end 23 of the bimetallic strip is located at the second position, the user can apply a pressing force to the pressing assembly 5 to make it push the reset rod 8 to sink, and then the reset rod 8 will push the tilted fourth end 72 of the reset rocker 7 to descend, and at the same time, the third end 71 of the reset rocker 7 tilts upward, and the upward force will push the second end 23 of the bimetallic strip to overcome the elastic force of the elastic member 6, so that the second end 23 of the bimetallic strip returns to the first position, the static contact 21 contacts the moving contact 31, and the key switch is energized.

[0106] It should be noted that, in this embodiment, the pressure exerted by the reset rod 8 on the fourth end 72 of the reset rocker 7 in the natural state is not enough to overcome the elastic force of the elastic member 6, that is, even if the fourth end 72 of the reset rocker 7 is subjected to the pressure generated by the deadweight of the reset rod 8, the second end 23 of the bimetallic strip is still maintained at the second position. The natural state refers to a state without external force.

[0107] In some embodiments of the present application, Fig.10 As shown, the third end 71 of the reset rocker 7 is provided with a weight reduction structure 74. Exemplarily, the weight reduction structure 74 includes at least one of a weight reduction hole and a weight reduction groove.

[0108] The fulcrum 73 of the reset rocker 7 is located in the middle thereof. By providing a weight-reducing structure 74 at the third end 71 of the reset rocker 7, the parts of the reset rocker 7 on both sides of the fulcrum 73 have different weights. Fig.11 and Fig.12 In the disconnected state and the on state shown, when the bimetallic strip does not contact the reset rocker 7, the fourth end 72 of the reset rocker 7 naturally droops, and the third end 71 naturally tilts; Fig.13 In the overload protection state shown, the bimetallic strip is deformed and presses the reset rocker 7, so that the fourth end 72 of the reset rocker 7 is tilted up under the pressure, and the third end 71 is drooped. In this way, combined with the deadweight of the fourth end 72 of the reset rocker 7, the reset rod 8 only needs to apply a small thrust to the reset rocker 7 to overcome the elastic force of the elastic member 6, that is, the pressing force required for reset is relatively small, which reduces the difficulty of reset and saves more effort.

[0109] In addition, if Fig. 9 and Fig.10 As shown, the weight-reducing hole provided at the third end 71 of the reset rocker 7 can also play a role in avoiding the plug-in piece 615 of the elastic member 6 .

[0110] The assembly of the reset rocker 7 in the mounting cavity 11 can be seen in Fig. 9 and Fig.10 In some embodiments of the present application, Fig.10As shown, the housing 1 has a first protrusion 15 formed in the mounting cavity 11 . The first protrusion 15 is located on a side of the reset rocker 7 away from the overload protection member 2 . The fulcrum 73 of the reset rocker 7 is placed on the first protrusion 15 .

[0111] Exemplarily, the first protrusion 15 may be a convex rib formed on the bottom wall of the base 12, and the convex rib abuts against the fulcrum 73 of the reset rocker 7, thereby supporting the reset rocker 7 to tilt. The bottom wall of the base 12 is a wall of the base 12 located on the side of the reset rocker 7 away from the reset rod 8. Optionally, the surface of the first protrusion 15 in contact with the reset rocker 7 is a curved surface, so that the two ends of the reset rocker 7 can tilt alternately.

[0112] In some embodiments of the present application, Fig.10 As shown, the housing 1 has a second protrusion 16 formed in the mounting cavity 11 . The second protrusion 16 is located on a side of the reset rocker 7 away from the first protrusion 15 and contacts the fulcrum 73 of the reset rocker 7 to limit the reset rocker 7 between the first protrusion 15 and the second protrusion 16 .

[0113] Exemplarily, the second protrusion 16 can be a rib formed on the side wall of the base 12, a portion of which extends to the side of the reset rocker 7 away from the first protrusion 15 and is loosely fitted with the reset rocker 7 to prevent the reset rocker 7 from detaching from the first protrusion 15 without hindering the reset rocker 7 from tilting.

[0114] Optionally, the surface of the second protrusion 16 that contacts the reset rocker 7 is an arc surface, so that the two ends of the reset rocker 7 can tilt alternately.

[0115] In some embodiments of the present application, Fig.10 As shown, the housing 1 has a third protrusion 17 formed in the mounting cavity 11 . The third protrusion 17 is located beside the reset rocker 7 . The reset rocker 7 has a limiting notch 75 at the fulcrum 73 . The third protrusion 17 is located in the limiting notch 75 .

[0116] Exemplarily, the third protrusion 17 may be another convex rib formed on the side wall of the base 12 , and the convex rib engages with the limiting notch 75 on the reset rocker 7 to prevent the reset rocker 7 from shifting.

[0117] Alternatively, if Fig.10 As shown, the third protrusion 17 and the second protrusion 16 can be located on the same side wall of the base 12, and the third protrusion 17 can be located on the side of the second protrusion 16 close to the bottom wall of the base 12, and the protrusion distance of the third protrusion 17 relative to the side wall of the base 12 is smaller than the protrusion distance of the second protrusion 16 relative to the side wall of the base 12.

[0118] Regarding the installation method of the reset rod 8, in some embodiments of the present application, as Fig. 9As shown, in the installation cavity 11, the reset rod 8 is located on the side of the reset rocker 7 close to the movable contact piece 3. Figure 1 One end of the reset rod 8 passes through the through opening 18 provided on the housing 1 and extends toward the pressing assembly 5; see Fig. 9 and Fig.10 The other end of the reset rod 8 is provided with an avoidance opening 81 , and the moving contact piece 3 and the overload protection member 2 both pass through the avoidance opening 81 .

[0119] The pressing component 5 is a component in the key switch used to transmit the pressing force applied by the user to the movable contact piece 3. In some embodiments of the present application, the pressing component 5 can directly adopt the pressing component of a traditional key switch.

[0120] For example, Figure 3 As shown, the pressing assembly 5 includes a switch cap 51, a bracket 52, a first elastic pressing member 53, a second elastic pressing member 54 and a push rod assembly 55. The switch cap 51 is fixed on the bracket 52 to receive the pressing force applied by the user; the bracket 52 is movably connected to the housing 1 and elastically connected to the first elastic pressing member 53, and the first elastic pressing member 53 is used to provide the bracket 52 with a restoring force opposite to the pressing force, so as to ensure that the switch cap 51 and the bracket 52 can return to the position before being pressed after the user removes the pressing force; the push rod assembly 55 is installed on the housing 1, and the second elastic pressing member 54 is elastically installed between the push rod assembly 55 and the moving contact piece 3, wherein the push rod assembly 55 can be actuated by the bracket 52 to push the second elastic pressing member 54 to press the moving contact piece 3.

[0121] The push rod assembly 55 and the housing 1 are movably connected, and the push rod assembly 55 and the bracket 52 may be connected or not connected.

[0122] Alternatively, if Figure 3 As shown, the push rod assembly 55 includes a first push rod 551 and a second push rod 552 . The first push rod 551 is sleeved on the outside of the second push rod 552 and is movably connected to the second push rod 552 . The second push rod 552 is elastically abutted against the second elastic pressing member 54 .

[0123] An exemplary structure of a push rod assembly 55 is provided below, in combination with Figure 3 and Figure 4As shown, the housing 1 is provided with a mounting sleeve with openings at both ends, and the push rod assembly 55 is located in the mounting sleeve. The first push rod 551 and the second push rod 552 are both hollow cylindrical structures. The first push rod 551 can be movably sleeved on the outside of the second push rod 552, and the second push rod 552 has an opening at one end away from the first push rod 551; one end of the second elastic pressing member 54 is located in the inner cavity of the second push rod 552 and elastically abuts against the end wall of the second push rod 552 opposite to the opening, and the other end of the second elastic pressing member 54 is located outside the second push rod 552 and elastically abuts against the movable contact piece 3.

[0124] like Figure 3 As shown, a plurality of first bevel teeth are arranged at intervals along the circumferential direction on the lower part of the first push rod 551, and a plurality of second bevel teeth are arranged at intervals along the circumferential direction on the outer wall of the second push rod 552, and the plurality of first bevel teeth can mesh with the plurality of second bevel teeth. At least one stopper is arranged on the bottom or inner wall of the mounting sleeve on the housing 1.

[0125] Optionally, the number of the first bevel teeth is four, and the four first bevel teeth are spaced apart from each other; the number of the second bevel teeth is eight, and the eight second bevel teeth are connected in groups of two, and the four groups of second bevel teeth are spaced apart from each other.

[0126] Based on the structure of the above-mentioned push rod assembly 55, when the first push rod 551 is pressed to push the second push rod 552 to move downward, the second bevel tooth will be pushed to a position below the limit block; then the pressing force is removed, and the second push rod 552 moves upward under the elastic force of the second elastic pressing member 54. At this time, the second bevel tooth may abut against the limit block, so that the second push rod 552 stays in the current position, so that the moving contact 31 is maintained in a position of contact and cooperation with the static contact 21; then, if the first push rod 551 is pressed again to push the second push rod 552 to move downward If the second push rod 552 moves, the second bevel tooth will move downward away from the limit block, and in the process of the second push rod 552 moving downward, based on the inclined surface matching relationship between the first bevel tooth and the second bevel tooth, the first bevel tooth will also synchronously drive the second push rod 552 to rotate; therefore, after the pressing force is removed again, the position of the second bevel tooth on the second push rod 552 is offset from the position of the limit block (that is, the limit block is aligned with the interval space between two adjacent second bevel teeth), so that the second push rod 552 can be reset, and the moving contact 31 will be out of contact with the static contact 21 based on the elastic deformation of the moving contact piece 3 itself.

[0127] It should be noted that in the above example, the up and down directions are parallel to the moving direction of the pressing component 5, wherein the moving direction of the switch cap 51 when pressed is defined as "down", and the moving direction of the switch cap 51 after the pressing force is removed is defined as "up".

[0128] Optionally, the first elastic pressing member 53 and the second elastic pressing member 54 may be compression springs.

[0129] In some embodiments of the present application, Figure 3 and Fig.10 As shown, the first elastic pressing member 53 is conductive and there are two of them. The key switch further includes an indicator light assembly 9 and a second terminal 10. The indicator light assembly 9 includes a light emitting member 91 and a resistor 92. The two ends of one first elastic pressing member 53 are elastically abutted against the bracket 52 and the resistor 92, respectively, and the resistor 92 is electrically connected to the movable contact piece 3; the two ends of the other first elastic pressing member 53 are elastically abutted against the bracket 52 and the second terminal 10, respectively, and the second terminal 10 is fixed to the housing 1; the two ends of the light emitting member 91 are electrically connected to the two first elastic pressing members 53, respectively.

[0130] In summary, the key switch provided in the embodiment of the present application splits the first terminal 4 into an input terminal 41 and an output terminal 42, and connects them to the moving contact piece 3 and the overload protection member 2 respectively; the moving contact 31 is provided on the moving contact piece 3, and the static contact 21 is provided on the overload protection member 2. When the key switch does not need to be powered on, the moving contact 31 and the static contact 21 are separated, the input terminal 41 and the output terminal 42 are independent of each other, and the first terminal 4 is not powered; when the key switch needs to be powered on, force can be applied to the pressing component 5 to actuate the moving contact piece 3 to drive the moving contact 31 to move until the moving contact 31 contacts the static contact 21, so that the input terminal 41 and the output terminal 42 are electrically connected, and the first terminal 4 is powered; when the key switch is powered on, when the current flowing through the overload protection member 2 is overloaded, that is, exceeds the current threshold, the overload protection member 2 will drive the static contact 21 away from the moving contact 31, thereby disconnecting the electrical conduction between the input terminal 41 and the output terminal 42, and then powering off the key switch. Therefore, the key switch provided in the embodiment of the present application combines the traditional key switch with the overload protection component 2, realizes the switch on-off function and the overload protection function through a simple structure, occupies a small space and has good safety.

[0131] The working principle of the key switch provided in the embodiment of the present application in the disconnected state, the on state and the overload protection state is as follows:

[0132] Fig.11A key switch in the disconnected state is shown, at which the bimetallic strip is warped upward under the action of the elastic member 6, and the second end 23 of the bimetallic strip abuts against the limit rib of the housing 1. When the user presses the switch cap 51, the first elastic pressing member 53 is compressed to store energy, and at the same time, the bracket 52 presses down the first push rod 551, and then presses down the second push rod 552, so that the second push rod 552 moves downward and rotates. When pressed to a certain position, the second beveled teeth of the second push rod 552 will abut against the limit block on the mounting sleeve of the housing 1, so that the second push rod 552 cannot move upward. In addition, during the process of pressing down the second push rod 552, the second push rod 552 also pushes the second elastic pressing member 54, so that the moving contact piece 3 rotates downward, and then the moving contact 31 can contact the static contact 21 on the bimetallic strip, so that the key switch enters the conducting state, and the indicator light assembly 9 is powered on and lights up. After the user releases the pressing force, the bracket 52 moves upward under the elastic force of the first elastic pressing member 53, and the switch cap 51 and the bracket 52 return to the positions before being pressed. Fig.12 shown.

[0133] exist Fig.12 In the on state shown, when the key switch is overloaded, the temperature of the bimetallic strip increases due to the increase in current, thermal expansion occurs, and the second end 23 of the bimetallic strip bends downward; when the bending arc of the bimetallic strip exceeds the equilibrium position, the second end 23 of the bimetallic strip will move downward rapidly under the elastic force of the elastic member 6, and the static contact 21 will quickly move away from the moving contact 31, and the key switch will be powered off. At the same time, the reset rocker 7 rotates clockwise under the push of the bimetallic strip, and the fourth end 72 pushes the reset rod 8 upward to move upward, entering the state as shown in FIG. Fig.13 The overload protection status is shown.

[0134] exist Fig.13 In the overload protection state shown, when no current flows through the bimetallic strip, the temperature of the bimetallic strip decreases, and the bimetallic strip has a tendency to bend and deform in the reverse direction. However, since the second end 23 of the bimetallic strip is subjected to the elastic force of the elastic member 6, it cannot break the equilibrium position and therefore cannot automatically return to its original position. At this time, the user needs to press the switch cap 51 again, and apply a thrust to the reset rod 8 through the bracket 52 to move the reset rod 8 downward. The reset rod 8 presses the tilted fourth end 72 of the reset rocker 7 to rotate the reset rocker 7 counterclockwise, and the third end 71 moves upward. The third end 71 of the reset rocker 7 applies pressure to the second end 23 of the bimetallic strip, so that the second end 23 of the bimetallic strip overcomes the elastic force of the elastic member 6 and rotates upward, and passes the equilibrium position and returns to the position in contact with the moving contact 31, so that the key switch enters the state as shown in FIG. Fig.12 The on-state is shown.

[0135] An embodiment of the present application further provides a socket, which includes the key switch described in the above embodiment.

[0136] The socket provided in the embodiment of the present application adopts the above-mentioned key switch, so it has an overload protection function, and has a simple structure and is easy to connect to electricity.

[0137] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0138] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A key switch, characterized in that: The key switch comprises a housing (1), an overload protection member (2), a movable contact piece (3), a first terminal (4) and a pressing assembly (5); The housing (1) has a mounting cavity (11), the overload protection element (2) and the moving contact piece (3) are both located in the mounting cavity (11), wherein the overload protection element (2) has a stationary contact point (21), and the moving contact piece (3) has a moving contact point (31); The first terminal (4) comprises an input terminal (41) and an output terminal (42) which are independent of each other, and the input terminal (41) and the output terminal (42) are respectively connected to the overload protection element (2) and the moving contact piece (3); The pressing assembly (5) is mounted on the housing (1) and is located on a side of the moving contact piece (3) away from the overload protection element (2), and the pressing assembly (5) can be pressed to actuate the moving contact (31) to move in a direction close to the stationary contact (21); When the moving contact (31) contacts the static contact (21), the input terminal (41) and the output terminal (42) are electrically connected; and the overload protection element (2) is configured to drive the static contact (21) to break contact with the moving contact (31) when the current flowing through the overload protection element (2) exceeds a set threshold.

2. The key switch according to claim 1, characterized in that: The overload protection element (2) is a bimetallic strip, the bimetallic strip having a first end (22) and a second end (23) opposite to each other, the first end (22) being fixed to the housing (1) and connected to the input terminal (41), and the second end (23) being suspended and having the static contact (21); The bimetallic strip can be deformed so that the second end (23) is away from the moving contact (31).

3. The key switch according to claim 2, characterized in that: The key switch further comprises an elastic member (6), two ends of the elastic member (6) respectively elastically cooperate with the housing (1) and the second end (23) of the bimetallic strip; The elastic member (6) can apply an elastic force to the bimetallic strip so that the second end (23) of the bimetallic strip is maintained in a first position or a second position, wherein when the second end (23) of the bimetallic strip is located in the first position, the static contact (21) can be in contact with the moving contact (31); when the second end (23) of the bimetallic strip is located in the second position, there is a gap between the static contact (21) and the moving contact (31).

4. The key switch according to claim 3, characterized in that: A snap-fitting portion (14) is provided on the inner wall of the housing (1), and one end of the elastic member (6) is snap-fitted with the snap-fitting portion (14); and / or, The second end (23) of the bimetallic strip is provided with an inserting portion (24), and the other end of the elastic member (6) is plug-fitted with the inserting portion (24).

5. The key switch according to claim 4, characterized in that: The elastic member (6) comprises a U-shaped elastic piece (61) and a connecting piece (62), wherein the U-shaped elastic piece (61) has a first free end (611) and a second free end (612), and the connecting piece (62) is bent and connected to an outer side wall (613) of the first free end (611); The engaging portion (14) is a slot (141), and the connecting piece (62) is located in the slot (141) and elastically abuts against a slot wall of the slot (141); The plug-in portion (24) is a slot (241) or a plug hole, and the second free end (612) of the U-shaped spring sheet (61) is provided with a notch (614) in the width direction to form a plug-in piece (615), and the plug-in piece (615) extends into the slot (241) or the plug hole and elastically abuts against the inner wall of the slot (241) or the plug hole.

6. The key switch according to any one of claims 3 to 5, characterized in that: The key switch also includes a reset rocker (7) and a reset rod (8); The reset rocker (7) is located on a side of the overload protection member (2) away from the movable contact piece (3), wherein when the second end (23) of the bimetallic strip is located at the second position, the plate surface of the reset rocker (7) contacts the second end (23) of the bimetallic strip, and the third end (71) of the reset rocker (7) droops, while the fourth end (72) of the reset rocker (7) tilts; wherein the third end (71) and the fourth end (72) of the reset rocker (7) are opposite to each other and are respectively located on both sides of a fulcrum (73) of the reset rocker (7), and the third end (71) and the static contact (21) are located on the same side of the fulcrum (73); The reset rod (8) is mounted on the housing (1) and contacts the fourth end (72) of the reset rocker (7). The reset rod (8) can be pressed by the pressing assembly (5) to push the raised fourth end (72) of the reset rocker (7) downward.

7. The key switch according to claim 6, characterized in that: The third end (71) of the reset rocker (7) is provided with a weight reduction structure (74).

8. The key switch according to claim 6, characterized in that: The housing (1) is formed with a first protrusion (15) in the installation cavity (11); the first protrusion (15) is located on a side of the reset rocker (7) away from the overload protection member (2); and a fulcrum (73) of the reset rocker (7) is placed on the first protrusion (15).

9. The key switch according to claim 8, characterized in that: The housing (1) is formed with a second protrusion (16) in the installation cavity (11); the second protrusion (16) is located on a side of the reset rocker (7) away from the first protrusion (15) and in contact with the fulcrum (73) of the reset rocker (7) so as to limit the reset rocker (7) between the first protrusion (15) and the second protrusion (16).

10. The key switch according to claim 6, characterized in that: The housing (1) is formed with a third protrusion (17) in the installation cavity (11); the third protrusion (17) is located beside the reset rocker (7); the reset rocker (7) is provided with a limiting notch (75) at the fulcrum (73); the third protrusion (17) is located in the limiting notch (75).

11. The key switch according to claim 6, characterized in that: In the installation cavity (11), the reset rod (8) is located on a side of the reset rocker (7) close to the movable contact piece (3); One end of the reset rod (8) passes through a through opening (18) provided on the housing (1) and extends toward the pressing assembly (5); The other end of the reset rod (8) is provided with an escape opening (81), and the movable contact piece (3) and the overload protection member (2) both pass through the escape opening (81).

12. The key switch according to claim 1, characterized in that: The pressing assembly (5) comprises a switch cap (51), a bracket (52), a first elastic pressing piece (53), a second elastic pressing piece (54) and a push rod assembly (55); The switch cap (51) is fixed on the bracket (52) and is used to receive pressing force; The bracket (52) is movably connected to the housing (1) and is elastically connected to the first elastic pressing member (53), and the first elastic pressing member (53) is used to provide the bracket (52) with a restoring force in the opposite direction to the pressing force; The push rod assembly (55) is mounted on the housing (1), and the second elastic pressing member (54) is elastically mounted between the push rod assembly (55) and the movable contact piece (3), wherein the push rod assembly (55) can be actuated by the bracket (52) to push the second elastic pressing member (54) to press the movable contact piece (3).

13. A socket, characterized in that: The socket comprises the key switch according to any one of claims 1-12.

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